Abstract
Pulsed Fourier transform 13C n.m.r. studies clearly demonstrate the presence of ethyl, butyl and longer chain branches in commercial low density polyethylene. The most suitable conditions for the measurement of the relative intensities of the resonance in the 13C spectrum, were determined using a standard linear long chain hydrocarbon. The 13C spectra of polyethylenes obtained using these parameters, in conjunction with a total methyl content by infra-red spectroscopy allow a quantitative measurement of the number of each branch type to be made.
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